package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;


@Service
public class UserServiceImpl implements UserService {

    // 微信服务接口地址，
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */

    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());

        // 按断openid 是否为空 如果为空表示登录失败 抛出业务异常
        if(openid == null ){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户 是否为新用户 ，
        User user = userMapper.getByOpenId(openid);
        if(user == null){
            user =  User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 如果是新用户 ，自动完成注册

        // 返回这个用户对象

        return user;
    }
    
    private String getOpenid(String code){
        // 调用 微信接口 服务  获得当前微信用户的openid
        Map<String,String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
